JPH0744808Y2 - Node connection device in frame structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a node connecting device having a frame structure composed of a bar and a joint.

[0002]

2. Description of the Related Art As a node connecting device having a frame structure composed of a bar and a joint of this type, a joint having a large number of concentric screw holes, a bar having a bolt hole, and a drive interposed between the joint and the bar. A type having a sleeve and threaded bolts for connecting the joint and the bar is known. In this case, in order to connect the bar with the joint, the threaded bolt is tightened and pretensioned by means of a drive sleeve which is mounted non-rotatably and axially displaceable, the drive sleeve being arranged between the bar and the joint. Will be exhibited in.

[0003]

DISCLOSURE OF THE INVENTION In a nodal connection device having a frame structure composed of a bar and a joint of the type described above, the screw bolt receives a dynamic load in the axial direction, and if this dynamic load continues for a long time, there is a risk of breakage and this Can have serious consequences, and a rotational moment spanner is used to pretension the screw bolt with a drive sleeve so that the pretension of the screw bolt is greater than the externally applied dynamic load. However, if the screw bolt of the node connecting device exceeds a predetermined size, the rotational moment to be applied becomes relatively high, and the reaction moment generated at that time causes the joint to twist, so this method is unsuitable. In addition, the known hydraulic spanner that produces such a high rotational moment is
Not only is it relatively difficult to operate, but it does not work well due to the fluctuation of the lever arm.

The present invention has been made in view of the above points, and in order to eliminate the risk of fatigue failure of a screw bolt under a longer dynamic load, a simple and easy-to-use tool can be used even with a screw bolt having a stronger structure. It is an object of the present invention to provide a nodal connection device having a frame structure composed of a bar and a joint which are pretensioned (extended) with the use of a bar.

[0005]

DISCLOSURE OF THE INVENTION A node connecting device having a frame structure composed of a bar and a joint according to the present invention is for connecting a joint having a large number of concentric screw holes, a bar having bolt holes, and the joint and the bar. In a nodal connection device in a framework structure consisting of a bar having a screw bolt and a drive sleeve axially movably mounted on the screw bolt, and a joint, the drive sleeve is composed of at least two members, A radially extending screw hole and a set screw screwed into the screw hole are provided in one member located on the side, and the drive sleeve is inclined in one direction on an opposing surface of one of two adjacent members. And a threaded surface inclined in the opposite direction to the threaded surface provided on one member is provided on the opposite surface of the other member.

[0006]

In the node connecting device having the frame structure composed of the bar and the joint of the present invention, the member forming the drive sleeve is
The provision of mutually cooperating threaded surfaces or wedge surfaces for extending the screw bolt allows the corresponding relative movements to be adjusted in opposite directions along the axis so that only one member is non-rotatable on the screw bolt. However, the axially displaceable arrangement reduces manufacturing costs, and the drive sleeves are adjusted by corresponding relative movements in opposite directions along the axis so that these members have their respective joints or bars. Due to the crimping against the ends and the continued relative movement, these members cause an axial pretension of the threaded bolt, this pretensioning acting externally on the respective threaded bolt. It is decided to be larger than the dynamic load.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described in detail below.

FIG. 5 shows a part of a frame-structured nodal connection device assembled from a bar and a joint. In FIG. 5, reference numeral 10 indicates a part of the joint, and reference numeral 11 indicates an end portion of the bar of the frame structure. Threaded bolts 12 are used to connect each bar end to the fitting 10. This screw bolt 1
2 is screwed into any one of a number of concentric threaded holes 13 in the fitting 10, so that the threaded bolt 12 is
It is rotatably and axially movably inserted into a hole 14 in each bar end.

A drive sleeve 15 is arranged on the threaded bolt 12 between the end of the bar 11 and the joint 10. In the case of the exemplary embodiment shown in FIGS. 1 to 3 and 5, this drive sleeve 15 is formed from three members 16, 17, 18. The outer end faces 19, 20 of the two members 16, 18 located on the end side of the drive sleeve 15 are flat, and these end faces 19, 20 are finally connected (FIG. 5).
At this time, it is crimped to the corresponding flat surface 21 of the joint 10 and the end surface 22 of the end portion of each bar 11. Of the three members 16, 17, 18 of the drive sleeve 15, one member 16 of the two adjacent members 16, 17 is formed with a threaded surface 23 inclined in one direction on the opposite surface, and the other surface is formed. Member 1
The threaded surface 23 provided on one member 16
A threaded surface 24 that is inclined in the opposite direction is formed.
Furthermore, two adjacent members 17 of the drive sleeve 15,
A threaded surface 25 inclined in one direction is formed on the facing surface of one member 17 of the eighteenth direction, and a direction opposite to the threaded surface 25 provided on the one member 17 is formed on the opposite surface of the other member 18. An inclined threaded surface 26 is formed at the bottom. That is, the threaded surfaces 23, 24 are arranged in the opposite direction to the threaded surfaces 25, 26. This is because, when rotating the member 17 is located between the drive sleeve 15 relative to the member 16, 18 located outside, 1 _{1 (Figure} 1 the length of the drive sleeve from 1 _{0 (FIG.} 2) ) Is meant to be increased to. This is used for extension or pretensioning of the threaded bolt 12.

The member 16 of the drive sleeve 15 is used to initially screw the bolt 12 into one threaded hole 13 of the coupling 10 and to tighten the bolt. This member 16 is arranged so as to be non-rotatable with respect to the screw bolt 12 and axially movable via a set screw 27 engaged in an axial groove (not shown) of the screw bolt 12. There is. To that end, the required rotational moment can be applied by means of a conventional spanner. In this way
If the bolt 12 is tightened and the drive sleeve 15 is stretched between the end of the joint 10 and the bar 11, the drive sleeve 15 is pretensioned as described above with the bolt 12 being correspondingly stretched. For that purpose, the sleeve central member 17 is provided on both sides of the drive sleeve member 1 by means of a tool 28, for example.
Corresponding rotary movements can be applied to 6 and 18.

This tool 28 comprises three wrench-shaped members 2
It has 9, 30, 31. Outer members 29, 31 include curved main end portions 32, 33, respectively, which end portions are
The members 34 are connected to each other in a yoke shape. In both of these end portions 32, 33 arcuate slot 3
5 are provided, which slot 35 cooperates to form a guide groove for a bolt 36, which is axially fixed in the guide groove by a nut 37. Bolt 36
Includes a threaded hole in its reinforced middle portion 38 for receiving a threaded spindle 39. Screw spindle 3
Instead of 9, it is also possible to insert a hydraulic cylinder. One end of the screw spindle 39 is rotatably connected to an end portion 41 of the central spanner-shaped member 30 via a ball bearing 40. When the spindle 39 is rotated,
The central spanner-like member 30 is moved with respect to both outer members 29, 31. The degree of this relative movement can be read by a scale 42 on the wrench-like member 30, which scale 42 cooperates with a pointer 43 on the wrench-like member 31. This scale 42 is preferably a drive sleeve 1.
The axial elongation of 5 and thus of the bolt 12 is scaled to be read on this scale.

The wrench-like members 29, 30, 31 are provided with corresponding jaw-shaped openings 44 for gripping the three members 16, 17, 18 of the drive sleeve 15, which openings 44 are openable. It is closed by the closing member 45. The closing member 45 includes spanner-shaped members 29, 30,
It is pivotally attached at 46 to 31 and is held in a closed position by bolts 47. The gap 48 (FIG. 1) that results from rotation of the drive sleeve member 17 relative to the drive sleeve members 16 and 18 is closed by a suitably insertable spacer 49.
Secures the adjusted position of the three members 16, 17, 18 of the drive sleeve 15.

In the embodiment shown in FIG. 7, the two-part drive sleeve 50 effects the extension of the bolt 12 and thus the axial pretensioning. Other similar parts are indicated by the same numbers as in the above-mentioned embodiment. The drive sleeve 50 has a bush 51, each with an outer thread 52 and a hexagonal portion 53 arranged on the end face. The bush 51 has a set screw 54 which is engaged in an axial groove (not shown) of the bolt 12.
Is arranged on the bolt 12 so as to be non-rotatable and movable in the axial direction. In this case, the bush 51 is used to screw the bolt 12 into the screw hole 13 of the joint 10, and the hexagonal portion 53 of the bush 51 is fitted with a normal spanner. Outer thread 5 of this bush 51
A nut-shaped member 55 is screwed onto the upper part of the shaft 2, and the nut-shaped member 55 projects axially beyond the bush 51. If, after tightening the bolt 12, it is stretched and thus pretensioned in the axial direction, the nut-like member 55 is rotated with respect to the hexagonal portion 53 of the buttsshe 51. To that end, a tool 56 can be used. This tool corresponds in principle to the tool of the embodiment according to FIGS. 4 and 5. Therefore, similar members are designated by the same numbers. Unlike the embodiment according to FIGS. 4 and 5, the two spanner-shaped members 5 of the tool 56
7, 58 are laterally curved, and the distal end of the member 58 is formed in a fork shape (FIG. 7). The end of this member 58 includes an arcuate slot 35 for guiding the bolt 36. This forked end is closed off from the top by a cross piece 59. The spanners 57 and 58 are the bush 51.
When it is mounted on the hexagonal portion 53 or the nut-shaped member 55 as shown in FIG. 7, a relative rotational movement occurs between the bush 51 and the nut-shaped member 55 when the screw spindle 39 rotates correspondingly. As a result, an extension of the drive sleeve 50 and thus of the bolt 12 and thus also its axial pretensioning takes place. At this time, the end surface of the bush 51 is pressed against the flat surface 21 of the joint 10 or the end surface 22 of the end portion of the rod 11.

In the embodiment according to FIGS. 8 and 9,
The drive sleeve 60 inserted through the bolt 12 is formed of three members 61, 62, 63. The member 61 of the drive sleeve 60 is similar to the drive sleeve member 16 of the embodiment according to FIGS. 1 to 3 and 5,
A set screw 64, which is engaged in an axial groove (not shown) of the bolt 12, is arranged so as to be non-rotatable and axially movable relative to the bolt 12. Therefore, this drive sleeve member 61 is similar to the member 16 in the manufacture of the bar connection, as is the drive sleeve member 62, 63 used to initially screw and tighten the bolt 12.
Are wedge surfaces 65 to 6 at their end faces facing each other.
6 is provided. In addition, in order to move the drive sleeve member 63 on the bolt 12 at right angles to the axial direction, the sleeve member 63 is provided with a slot-shaped opening 67 for receiving the bolt 12. Upon such orthogonal movement of the sleeve member 63 relative to the sleeve member 62, the wedge surfaces 65 and 66 cooperate to cause an increase in the length of the sleeve 60.

Sleeve member 6 to sleeve member 62
The movement of 3 at right angles to the above-mentioned axial direction is caused by the tool 68. The tool 68 includes an essentially C-shaped rigid frame 69. On the rigid frame 69, the hydraulic cylinder 70 and the support 71 are aligned with each other and fixed so as to face each other. The piston 72 and the support 71 of the hydraulic cylinder 70 are dimensioned so that the sleeve members 62 to 63 can be gripped on the opposite surfaces. Hydraulic cylinder 7
When hydraulic fluid is introduced to 0 via conduit 73,
The piston 72 of the cylinder projects to move the drive sleeve member 63 axially at right angles to the sleeve member 62. The friction between the wedge surfaces 65 and 66 is due to the sleeve member 62.
And 63 are large enough to be held in their adjusted position. After the extension or pretension of the bolt 12 by the extension of the drive sleeve 60, the piston 72 is again inserted into the hydraulic cylinder 70 by the switching of the control valve, not shown,
The tool 68 can be separated.

Instead of the screw head bolt 12 with a screw head shown in the above-mentioned respective embodiments, a bolt having a differential screw thread can be used, and this screw thread has a screw hole 13 or a bar of the joint 10. Is screwed into the screw hole at the end of the. Also, unlike the embodiments described above, other connection methods can be chosen between the drive sleeve and the screw bolt, which are non-rotatable but permit a limited amount of axial relative movement.

[0017]

As described above, according to the present invention, a large-sized screw bolt having a widely stretched frame structure can be pretensioned (extended) as described above, and at this time, the sleeve A relatively simple tool can be used to produce the required relative movement between the members of the. Also, the decoupling of the nodal connections can likewise be easily carried out using the same tool, and the drive sleeve is simple in construction.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a node connecting device in a frame structure including a bar and a joint according to the present invention is in a maximum length position.

FIG. 2 is a perspective view showing a state in which the node connecting device is in the minimum length position in the frame structure including the bar and the joint according to the present invention.

FIG. 3 is an exploded perspective view of a drive sleeve.

FIG. 4 is a side view of a tool for actuating a drive sleeve.

FIG. 5 is a front view of a tool for actuating a drive sleeve.

FIG. 6 is a side view of a tool for actuating a two-part drive sleeve.

FIG. 7 is a front view of a tool for actuating a two-part drive sleeve.

FIG. 8 is a side view of a modified multi-member drive sleeve having an increased length due to a wedge surface.

9 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 10 Joint 11 End of Bar 12 Screw Bolt 15 Drive Sleeve 23 Wedge 27 Set Screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Reinhard, Schmidek Germany 8700, Wurzburg, Peterhof Argasse, 2 (72) Creator Manfred, Stark Germany 8709, Rimpal, Ziegerreistrasse, 7 (56) Bibliographic Reference Showa 47-38360 (JP, U)

Claims (5)

[Scope of utility model registration request] 1. A joint having a large number of concentric screw holes, a bar having bolt holes, a screw bolt for connecting the joint and the bar, and a drive sleeve axially movably mounted on the screw bolt. In the node connecting device in the frame structure including the bar and the joint, the drive sleeve is composed of at least two members, and a screw hole radially extending to one member located at the end side and screwed to the screw hole. And a set screw is provided, and a threaded surface inclined in one direction is formed on the facing surface of one of the two adjacent members of the drive sleeve, and the threaded surface is provided on the facing surface of the other member on the one member. A nodal point connecting device in a frame structure composed of a bar and a joint, wherein a threaded surface inclined in a direction opposite to the threaded surface is formed. 2. The nodal point in the frame structure according to claim 1, wherein the drive sleeve is composed of three members, and the three members have opposite threaded surfaces at their end surfaces facing each other. Coupling device. 3. A nodal connection device in a framework structure according to claim 2, characterized in that insertable fixing elements are provided between the respective members of the drive sleeve in order to fix them in their adjusted position. . 4. A drive sleeve, which is non-rotatably and axially movably disposed on a screw bolt and has a thread and a hexagonal portion on the outer periphery, and a drive sleeve which is screwed into the thread and projects at least axially. The nodal connection device in the frame structure according to claim 1, wherein the nodal connection device is composed of individual nut-shaped members. 5. The hexagonal portion is arranged on the end surface of the bush,
5. The node connecting device in a frame structure according to claim 4, wherein the outer thread of the bush extends from the hexagonal portion to the other end surface of the bush.